We’ve heard of strange misconduct at law firms, but Adrian Rodriguez’s misdeeds are just plain bizarre.

Rodriguez, 39, worked in the copying department at Fried Frank Harris Shriver & Jacobson for a decade. Between October 2010 and December 2012, he ordered an excessive amount of copy machine toner from the law firm’s suppliers. Rodriguez then resold the toner—which retails between $80 and $259—at a discount, collecting a mere $10 per box of black ink toner and $15 per box of color ink toner.

Authorities arrested Rodriguez in December during a sting operation at Fried Frank’s New York headquarters, where they found him using the parking garage to sell his discounted toner.

Yesterday, Rodriguez pleaded guilty to stealing more than $376,000 of copy machine toner from Fried Frank’s suppliers. The crime equates to grand larceny in the second degree, according to a statement from the Manhattan district attorney’s office.

A judge is slated to sentence Rodriguez on May 21. He faces between five and 15 years in prison.